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</pre><pre class="rust ">
<span class="comment">// Thread-ID -- Get a unique thread ID</span>
<span class="comment">// Copyright 2016 Ruud van Asseldonk</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class="comment">// you may not use this file except in compliance with the License.</span>
<span class="comment">// A copy of the License has been included in the root of the repository.</span>

<span class="doccomment">//! Thread-ID: get a unique ID for the current thread.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! For diagnostics and debugging it can often be useful to get an ID that is</span>
<span class="doccomment">//! different for every thread. This crate provides that functionality.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Example</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::thread;</span>
<span class="doccomment">//! use thread_id;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! thread::spawn(move || {</span>
<span class="doccomment">//!     println!(&quot;spawned thread has id {}&quot;, thread_id::get());</span>
<span class="doccomment">//! });</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! println!(&quot;main thread has id {}&quot;, thread_id::get());</span>
<span class="doccomment">//! ```</span>

<span class="attribute">#<span class="op">!</span>[<span class="ident">warn</span>(<span class="ident">missing_docs</span>)]</span>

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">unix</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">libc</span>;

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">windows</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">kernel32</span>;

<span class="doccomment">/// Returns a number that is unique to the calling thread.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Calling this function twice from the same thread will return the same</span>
<span class="doccomment">/// number. Calling this function from a different thread will return a</span>
<span class="doccomment">/// different number.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span>() <span class="op">-&gt;</span> <span class="ident">usize</span> {
    <span class="ident">get_internal</span>()
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">unix</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">get_internal</span>() <span class="op">-&gt;</span> <span class="ident">usize</span> {
    <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">pthread_self</span>() <span class="kw">as</span> <span class="ident">usize</span> }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">windows</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">get_internal</span>() <span class="op">-&gt;</span> <span class="ident">usize</span> {
    <span class="kw">unsafe</span> { <span class="ident">kernel32</span>::<span class="ident">GetCurrentThreadId</span>() <span class="kw">as</span> <span class="ident">usize</span> }
}

<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">distinct_threads_have_distinct_ids</span>() {
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">mpsc</span>;
    <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;

    <span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">mpsc</span>::<span class="ident">channel</span>();
    <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> <span class="ident">tx</span>.<span class="ident">send</span>(::<span class="ident">get</span>()).<span class="ident">unwrap</span>()).<span class="ident">join</span>().<span class="ident">unwrap</span>();

    <span class="kw">let</span> <span class="ident">main_tid</span> <span class="op">=</span> ::<span class="ident">get</span>();
    <span class="kw">let</span> <span class="ident">other_tid</span> <span class="op">=</span> <span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
    <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">main_tid</span> <span class="op">!=</span> <span class="ident">other_tid</span>);
}
</pre>
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